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[PATCH] SELinux: extend task_kill hook to handle signals sent by AIO completion

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This patch extends the security_task_kill hook to handle signals sent by AIO
completion.  In this case, the secid of the task responsible for the signal
needs to be obtained and saved earlier, so a security_task_getsecid() hook is
added, and then this saved value is passed subsequently to the extended
task_kill hook for use in checking.

Signed-off-by: David Quigley <[email protected]>
Signed-off-by: James Morris <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: Chris Wright <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Quigley 2006-06-30 01:55:46 -07:00 • committed by Linus Torvalds
commit f9008e4c5c
3 changed files with 40 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

6
security/dummy.c
View file

@ -506,6 +506,9 @@ static int dummy_task_getsid (struct task_struct *p)
return 0;
}
static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
{ }
static int dummy_task_setgroups (struct group_info *group_info)
{
return 0;
@ -548,7 +551,7 @@ static int dummy_task_wait (struct task_struct *p)
}
static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
int sig)
int sig, u32 secid)
{
return 0;
}
@ -981,6 +984,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, task_setpgid);
set_to_dummy_if_null(ops, task_getpgid);
set_to_dummy_if_null(ops, task_getsid);
set_to_dummy_if_null(ops, task_getsecid);
set_to_dummy_if_null(ops, task_setgroups);
set_to_dummy_if_null(ops, task_setnice);
set_to_dummy_if_null(ops, task_setioprio);

20
security/selinux/hooks.c
View file

@ -2644,6 +2644,11 @@ static int selinux_task_getsid(struct task_struct *p)
return task_has_perm(current, p, PROCESS__GETSESSION);
}
static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
{
selinux_get_task_sid(p, secid);
}
static int selinux_task_setgroups(struct group_info *group_info)
{
/* See the comment for setuid above. */
@ -2700,12 +2705,14 @@ static int selinux_task_movememory(struct task_struct *p)
return task_has_perm(current, p, PROCESS__SETSCHED);
}
static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig)
static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
int sig, u32 secid)
{
u32 perm;
int rc;
struct task_security_struct *tsec;
rc = secondary_ops->task_kill(p, info, sig);
rc = secondary_ops->task_kill(p, info, sig, secid);
if (rc)
return rc;
@ -2716,8 +2723,12 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int si
perm = PROCESS__SIGNULL; /* null signal; existence test */
else
perm = signal_to_av(sig);
return task_has_perm(current, p, perm);
tsec = p->security;
if (secid)
rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL);
else
rc = task_has_perm(current, p, perm);
return rc;
}
static int selinux_task_prctl(int option,
@ -4434,6 +4445,7 @@ static struct security_operations selinux_ops = {
.task_setpgid = selinux_task_setpgid,
.task_getpgid = selinux_task_getpgid,
.task_getsid = selinux_task_getsid,
.task_getsecid = selinux_task_getsecid,
.task_setgroups = selinux_task_setgroups,
.task_setnice = selinux_task_setnice,
.task_setioprio = selinux_task_setioprio,